MESON Chess Problem Database

Problem Display
PID: 93421 (1qnbn2Q/R1P1k3/2R1Bp1K/8/8/3r3p/8/4r3 w - - 0 1)

Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)

Shakhmaty v SSSR, 1938

1qnbn2Q/R1P1k3/2R1Bp1K/8/8/3r3p/8/4r3

#2

6 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sb6
      • 2.c8S#
    • 1...Sg7
      • 2.cxd8Q#
      • 2.cxd8B#
  • Tries
    • 1.Qh7+?
      • 1...Kf8
        • 2.Qf7#
      • 1...Sg7!
    • 1.cxd8R+?
      • 1...Qxa7
        • 2.Rxe8#
        • 2.Qxe8#
      • 1...Qc7
        • 2.Rxe8#
        • 2.Qxe8#
      • 1...Qb7
        • 2.Rxe8#
        • 2.Qxe8#
      • 1...Rd7
        • 2.Raxd7#
        • 2.Rdxd7#
        • 2.Rxe8#
        • 2.Qxe8#
      • 1...Sxa7
        • 2.Qxe8#
      • 1...Sc7
        • 2.Re8#
        • 2.Qe8#
        • 2.Qf8#
      • 1...Kxd8!
  • Keys
    • 1.Bf7!
      • threat
        • 2.Qxe8#
      • 1...Kd7
        • 2.cxb8S#
      • 1...Kxf7
        • 2.cxd8S#
      • 1...Sxc7
        • 2.Qe8#
      • 1...Scd6
        • 2.c8S#
      • 1...Sed6
        • 2.cxd8Q#
        • 2.cxd8B#
      • 1...Sg7
        • 2.cxd8Q#
        • 2.cxd8B#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • S(g);OGATE::P=S
    • S(i);::PXB(h)=Q
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • K(e);S_FLIGHT::QAR1(F)
      • Refutation
        • S(i);P_SPINS(i)
    • Try
      • P(E);CHECK,XB(h)
      • Vars
        • S(g);XR(D)::QAR1(F),XS(i)
      • Refutation
        • K(e);P_SPINS(i),S_FLIGHT,XR(E)
  • Actual
    • B(B);
    • Threat
      • QAR1(F),XS(i)
    • Vars
      • K(e);P-FLIGHT::PXQ(f)=S
      • K(e);P-FLIGHT,XB(B)::PXB(h)=S
      • S(i);P_SPINS(i),XP(E)::QAR1(F)
      • S(g);OGATE::P=S
      • S(i);::PXB(h)=Q
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